I still look at the Woensdag WEB video on Youtube almost daily. And for the first time I noticed at least one team partially retract the windward dagger board only. I can't remember if I asked this before, but apart from coming back to beach, or going over shallow water, when/why is it advantageous to retract the dagger board? I began to think that it was whenever the kite was going up, but I see some in the video with the board up, and no kite.

Thanks in advance!